| ABSTRACT |
A detachable electric power-driven unit for driving a wheeled vehicle comprises a base, means attached to the base for driving the vehicle wheels, independently controlled by a control unit which receives signal input from a controller, means for coupling the base to the vehicle, and a power supply unit for providing electrical energy to the power driven unit, wherein the means for 10 driving the vehicle wheels are rotary devices in contact with the periphery of the wheels for creating friction torque which rotates the wheels
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